284 MR. BELL, HORiE CARCINOLOGIC^ ; 



middle tooth being longer than the lateral ; the thoracic sinus terminates anteriorly in a 

 notch, which reaches upwards to the margin of the carapace between the hepatic and 

 branchial regions. The abdomen is long, lanceolate, and slightly hastate at the base. 

 This is one of the two species so often figui'ed and described, and the only ones known 

 until within the last few years. It is very probably the Cancer' cixmiolaris of Linnseus, 

 and certainly that figui-ed under this name by Herbst ; it is the Leucosia craniolaris of 

 Fabricius and all subsequent authors. There are several specimens in the British Mu- 

 seum, in the Banksian Collection of the linnean Society, and in my own collection. It 

 inhabits the Eastern Seas, being found on the coast of China, &c. 



There are several other species which resemble it in some degree in general form and 

 proportions, but the paucity of tubercles on the arm sufficiently distinguishes it from them 

 all, excepting L. rhomboidalis of De Haan, which is certainly very nearly allied to it, but 

 differs in the hairy surface of the arms. 



Leucosia obtusifroks, De Haan. Fronte rotundato ; sinu thoracico antice cii'culari, 

 tuberculis cii'cimiscripto ; brachiis ad latera et ad basm tuberculatis ; manibus 

 longioribus quam latioribus, serie granulorum ad margtnem interiorem. 



De Haan, Crust. Japon. p. 133. t. 33. f. 2. 



Hab. ad ins. Japoniam. Mus. Brit. 



Leucosia unidentata, De Haan. Fronte unidentato ; sinu thoracico antice circulari, 

 tuberculis perlatis cu'cumscripto ; brachiis facie superiore seriebus binis tuberculorum. 



De Haan, Crust. Japon. p. 133. t. 33. f. 3. 



Hab. Japonia, ins. Moluccenses, &c. Muss. Brit., Bell. 



Leucosia rhomboidalis, De Haan. Testa rhomboidaH, antice producta, multo longiore 

 quam latiore ; brachiis basi utrinque dense tomentosis, lateribus tuberculatis, supra 

 plerunique Isevibus. 



De Haan, Crust. Japon, p. 132. t. 33. f. 5. 



Hab. ? Mus. Brit. 



Leucosia longifrons, De Haan. Testa subglobosa, fronte producto, integerrimo ; sinu 

 thoracico antice eUiptico, granis non cincto ; brachiis lateribus tuberculatis et granidis 

 paucis ad basin. 



De Haan, Crust. Japon. p. 132. t. 33. f. 4. 



Hub. ? Mus. Brit. 



Leucosia orbicularis, milii (Tab. XXX. fig. 1). Testa orbiculari, fronte lato, brevis- 



simo, bidentato ; sinu thoracico nuUo ; sterno in utroque sexu antice granulato. 

 Hab. ad oras Australiae. Muss. Brit., Bell. 



The carapace in this species offers the nearest approach to the orbicular form of any of 

 the genus. The front remarkably broad, scarcely projecting, and slightly bidentate; 

 hepatic region not distinct ; marginal line nearly smooth anteriorly, the marginal granu- 

 lations becoming conspicuous over the branchial region, and continued in an uninterrupted 



